the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Lessons learnt from rockfall time series analysis: data collection, statistical analysis and applications
Sandra Melzner
Marco Conedera
Johannes Hübl
Mauro Rossi
Abstract. Historical rockfall catalogues are important data sources for the investigation of the temporal occurrence of rockfalls, which is a crucial information for rockfall hazard and risk assessments. However, such catalogues are rare and often incomplete. Here, we analyse seven catalogues of historical rockfalls in Austria, Italy, and the USA to highlight existing relationships between the data collection and mapping methods and the representativeness of the resulting rockfall records. Heuristic and simple statistically-based frequency analysis methods are applied to describe and compare the different historical rockfall catalogues. Our results show that different mapping strategies may affect the frequency of the assessed rockfall occurrence and the completeness/representativeness of the related time series of historical rockfalls. We conclude presenting the advantages and limitations of the application of different frequency-based methods for analysing rockfall catalogues and providing recommendations for rockfall mapping. We furthermore present non-parametric statistical methods for dealing with typically small rockfall datasets which are particularly suited for the characterization of basic rockfall catalogues. Such recommendations should help for the definition of standards for collecting and using temporal rockfall data in hazard and risk assessments.
Sandra Melzner et al.
Status: open (until 11 Apr 2023)
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RC1: 'Comment on nhess-2023-10', Daniel Costantini, 23 Mar 2023
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General comments:
Very interesting statistical analyses of different rockfall catalogues and the resulting conclusions and relationships.Specific comments:
An interesting aspect would be to look at the data from the IFFI (Inventario dei fenomeni franosi d'Italia), available and downloadable from the IdroGEO platform, and compare it with the data sets of this study. The IdroGEO platform is for example up to date for the Autonomous Province of Bolzano and contains numerous, also very detailed records and data of rockfalls. Presumably, a change point in the 2000s could also be traced back to digitalisation and the simplified reporting of events (letter correspondence / fax vs. emails).When drawing conclusions, one could possibly take into account that experience shows that a whole series of events occur especially during major events (storm fronts with high intensities), whereby the smaller, at that time irrelevant events usually get lost in the background or are not considered due to the prevailing state of emergency and are thus not taken into account in the data collection. This is certainly also an aspect of the completeness / incompleteness of rockfall catalogues and data sets.
Technical Corrections:
- Line 195: [...] The comparison of the historical rockfall catalogue CH8 and the rockfall catalogue of damage CH10 (Table 1 and Fig. 2) reveals [...] Fig. 3 not Fig. 2 or?Citation: https://doi.org/10.5194/nhess-2023-10-RC1
Sandra Melzner et al.
Sandra Melzner et al.
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